+1 Bart. I have tried different straight NB voltage increase and nothing. I use CPU/NB @1.3 for 2400-2600 on NB. Anything less gives me instability. Have no idea how NB voltage can help.Edited by jimibgood - 5/25/09 at 1:19pm

This is where I have my 955 with a 24/7 (almost) 3.9... This might help you get an idea.
on AM2+ you can keep the CPU NB multi at 2600 or less, and on AM3 you can get upwards of 2600-2800.
On Processor NB Voltage you can keep this around 1.27-1.30, and I usually had my HT Link at 2400 but here its at 2200. Also with all of these settings pushed like this, look at my temps after running vantage and then a Prime 1hr session. Not bad. Im hitting 47*C full max load. This CPU runs so cool.

Hey though which CPU are you running? and on what board?
I dont see it, and different CPU's handle things differently.
I dont have a screen shot of just my CPU-Z and Im at work, so I had to include my Vantage.

So I should increase my CPU NB V if I'm pushing my ram to it's limits?

What about my NB voltage? Should I keep it at 1.2V? Doesn't it matter for NB frequency?

for overclocking memory, yes you need to increase your CPU NB V if your overclock fails because of insufficient voltages supplies to the sdrams.

when you increase the base clock/bus speed (normally 200 MHz), this also increases the HT Link speed (or your NB frequency, as you call it). if you keep it at its default clocks by lowering the HT multiplier while increasing your base clock/bus speed, you shouldn't have to increase the NB voltage. keeping HT Link/NB frequency/voltages at default also keeps your NB chipset cooler.

This is where I have my 955 with a 24/7 (almost) 3.9... This might help you get an idea.
on AM2+ you can keep the CPU NB multi at 2600 or less, and on AM3 you can get upwards of 2600-2800.
On Processor NB Voltage you can keep this around 1.27-1.30, and I usually had my HT Link at 2400 but here its at 2200. Also with all of these settings pushed like this, look at my temps after running vantage and then a Prime 1hr session. Not bad. Im hitting 47*C full max load. This CPU runs so cool.

Hey though which CPU are you running? and on what board?
I dont see it, and different CPU's handle things differently.
I dont have a screen shot of just my CPU-Z and Im at work, so I had to include my Vantage.